vulnerability / NVI-00018385 / Revision 1
tmp has Path Traversal via unsanitized prefix/postfix that enables directory escape
GitHub lists this reviewed advisory for tmp. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
tmp
source listed< 0.2.6
### Summary The tmp npm package contains a path traversal vulnerability that allows escaping the intended temporary directory when untrusted data flows into the `prefix`, `postfix`, or `dir` options. By embedding traversal sequences (e.g., `../`) or path separators in these parameters, attackers can cause files to be created outside the configured temporary base directory at attacker-controlled locations with the privileges of the running process. This vulnerability affects applications that pass user-controlled data to tmp's file/directory creation functions without proper input sanitization. ### Details **Root Cause:** The vulnerability exists in tmp's path construction logic where user-supplied options are directly concatenated into file paths without sanitization or validation. **Technical Flow:** 1. **Filename Construction:** tmp builds filenames as `---` 2. **Path Composition:** Final path computed as `path.join(tmpDir, opts.dir, name)` 3. **Path Normalization:** Node.js `path.join()` normalizes traversal sequences, allowing escape 4. **File Creation:** File created at the resulting (potentially escaped) path **Vulnerable Pattern:** ```javas
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
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04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
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- GHSA-ph9p-34f9-6g65 ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.